The analog gas sensor - MQ3 is suitable for detecting alcohol, this sensor can be used in a Breathalyser.It has a high sensitivity to alcohol and small sensitivity to Benzine. The sensitivity can be adjusted by the potentiometer.

Improvements

Easily recognitive interfaces of sensors ("A" for analog and "D" for digital)

Icons to simplely illustrate sensor function

High quality connector & potentiometer

Immersion gold surface

Specification

Power supply: 5V

Interface type: Analog

High sensitivity to alcohol and small sensitivity to Benzine

Fast response and High sensitivity

Stable and long life

Simple drive circuit

Size: 36.4 x 26.6 mm

Parts List

Analog Gas sensor (MQ3)x1

Analog Cable x1

Acrylic Base(with nylon screws) x1

Notice: The new version of analog sensor port pin mapping has been changed as the following two features.Please check the tips for changing sensor cable pin mapping while using the I/O Expansion shield. We will continue to update. For the inconvenience caused, please understand.